Geopolymer concrete for curing at normal temperature
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Recent studies have shown that the properties of emerging low-emission geopolymer binders are similar or superior to those of the OPC binder traditionally used for concrete. Most of the previous studies in literature used heat curing to demonstrate the properties of geopolymer mixtures. Though heat curing is a common practice for making precast concrete products, it is an energy consuming process and can be viewed as a limitation for cast-in-situ applications of concrete. This paper presents an investigation on the behaviour of geopolymer concrete cured at relatively low temperature without any additional heat for the curing process. Small proportions of ground granulated blast furnace slag (GGBFS) were added with fly ash in order to improve the early age properties of geopolymer concrete. Test samples were cured at a temperature of 20-23oC. Results show that inclusion of slag helped achieve setting time and compressive strength comparable to those of OPC concrete at the early ages. Fracture properties were similar to those of conventional OPC concrete. Drying shrinkage of geopolymer concrete reduced when slag was included in the binder. Permeability properties and sulphate resistance of slag blended fly ash geopolymer are found to be better than those of OPC concrete.
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Deb, Partha; Nath, Pradip; Sarker, Prabir (2013)The properties of concrete using fly ash based geopolymer as the binder were shown in recent studies. However, most of the previous studies focused on the properties of geopolymer concrete samples cured at high temperature. ...
Khan, M.; Shaikh, Faiz; Hao, Y.; Hao, Hong (2017)Geopolymer is an attractive sustainable binder as compared to Ordinary Portland Cement (OPC) in concrete. Recent investigations show that mechanical properties of heat cured geopolymers are similar or comparatively better ...
Nath, Pradip; Sarker, Prabir (2015)Fly ash based geopolymer is an emerging low-emission binder for concrete. Recent studies have shown that the properties of geopolymers are similar to those of the OPC binder traditionally used for concrete. Most previous ...